When you have a task with multiple subtasks, rather than triggering a date change to that specific subtask when the status has changed, it sets off a downstream chain of automated due dates for the following subtasks. For example; Subtask 1 is changed from 'to-do' to 'in progress' This then sets Sub task 2's due date to 7 days away Once sub task 2's status is changed from to-do= it will set subtask 3'd due date to a week later and so on.